a loud horn to alert people to the presence of smoke.
Most smoke detectors operate using either a 9-volt battery or 120-volt electrical house current. There are two main types of smoke detector sensors.
Photoelectric detectors use beams of light or low-powered lasers. In the event of a fire that generates sufficient smoke, these light beams would be blocked, triggering an alarm. Photoelectric detectors tend to be larger and aren't very sensitive.
Ionization detectors use an ionization chamber and a source of ionizing radiation to detect smoke. Compared to photoelectric detectors, ionization detectors are much more sensitive, smaller, and cheaper. As a result, they're also much more common in homes.
All smoke detectors consist of just two basic parts
- a sensor to detect smoke and
- a loud horn to alert people to the presence of smoke.
Most smoke detectors operate using either a 9-volt battery or 120-volt electrical house current. There are two main types of smoke detector sensors.What's the problem?
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